The greenish color of the nasal mucus does not mean that it is almost ready, but indicates the presence of bacterial infection, which requires timely and targeted anti-infective treatment. The most common cause of green nasal mucus is acute rhinitis and sinusitis caused by Pseudomonas aeruginosa infection, at this time, the bacterial growth and reproduction can secrete a large number of green secretions, and combined with the nasal mucus, which can be accompanied by other symptoms of respiratory tract infections, such as coughing, coughing sputum, sneezing, nasal congestion, loss of sense of smell, etc. Commonly used antibiotics, such as ceftazidime, aminotrimethylamine, etc., can be effective in controlling the infection. Patients are advised to go to ENT department for further examination, such as bacterial culture and drug sensitivity test, and follow the doctor’s instructions to standardize the medication and treatment.